CN100542807C - The automatic platemaker of galley - Google Patents

Abstract

The invention provides a kind of laser engraving machine, it has: at its peripheral part flexible photoreceptor material (10) and recording drum (11) that is rotated and the record head (20) that constitutes in the direction parallel with the axis of this recording drum (11) are installed with can move freely.Record head (20) has: first LASER Light Source (21), and it penetrates accurate engraving light beam (L1); Second LASER Light Source (24), it penetrates roughhew and carves light beam (L2); AOM (22), it is used to modulate accurate engraving light beam (L1); AOD (23), it makes accurate engraving light beam (L1) scan at the axis direction of recording drum (11); AOM (25), its modulation roughhew is carved light beam (L2); Combination mechanism (27); Optical system (26), it makes by combination mechanism (27) synthetic precision engraving light beam (L1) and roughhew and carves light beam (L2) optically focused on flexible photoreceptor material (10).

Description

The automatic platemaker of galley

Technical field

The present invention relates to a kind of automatic platemaker of the galley that the galley of intaglio printing plates such as relief printing plates such as for example flexible printing plate and intaglio plate etc. is made a plate.

Background technology

All the time, as the automatic platemaker of this galley, the known laser engraving machine that for example has in No. 5327167 specification record of United States Patent (USP).This laser engraving machine is by the surface of using the laser beam flying recording materials that penetrate from LASER Light Source to carve recording materials, thus the engraving machine that relief printing plate is made a plate, and it has: LASER Light Source; Modulator, it is used to modulate the laser beam that penetrates from this LASER Light Source; Recording drum is installed recording materials and is made this recording materials rotation at its peripheral part; Record head, it constitutes in the direction parallel with the axis of this recording drum with can move freely, and to the laser beam of the recording materials irradiation that is installed in the recording drum peripheral part from the LASER Light Source ejaculation.

In the automatic platemaker of this galley, based on the speed of the power and the recording materials of LASER Light Source, with the main surface sweeping speed of laser beam, be that the rotary speed of recording drum is set the value that can obtain needed maximum carving depth for.And, under the state of the power of the laser beam that has reduced to be radiated at recording materials, carry out engraving than the shallow carving area of maximum carving depth.At this moment, there are the following problems: owing to the bigger energy of engraving needs of the laser material that is undertaken by laser beam, so the plate-making of galley needs the long time.

Disclose the manufacture method of following printing block at No. 3556204 communique of Japan Patent, be about to the manufacture method that a plurality of laser beams are radiated at the printing block of making embossment (relief) on the recording materials simultaneously.

In addition, the inventor has proposed the automatic platemaker of following galley: promptly, after use has the laser beam of first beam diameter and carves with first pel spacing irradiation recording materials, use laser beam and carves (the special 2004-286175 of hope, the special 2004-357586 of hope) with second pel spacing irradiation recording materials different with first pel spacing with second beam diameter different with above-mentioned first beam diameter.According to this automatic platemaker, can shorten the plate-making time by using laser beam effectively.

In the manufacture method of the printing block that No. 3556204 communique of above-mentioned Japan Patent put down in writing, a plurality of laser beams can be radiated at simultaneously on the recording materials and can make embossment effectively, but because the pel spacing of each laser beam keeps certain, so be difficult to carry out accurate engraving.On the other hand, after use has the laser beam of first beam diameter and carves with first pel spacing irradiation recording materials, when use has the laser beam of second beam diameter different with above-mentioned first beam diameter and carves with second pel spacing different with first pel spacing irradiation recording materials, can carry out accurate engraving effectively, but owing to needed two procedures before engraving is finished, expectation further improves the efficient of engraving operation.

Summary of the invention

The object of the invention is to provide the automatic platemaker of the galley that can carve accurate image at high speed.

The purpose of the invention described above realizes by following technical characterictic: the automatic platemaker of galley has, the recording drum of recording materials being installed and being rotated at its peripheral part; First irradiation means, it penetrates first laser beam, and this first laser beam has first beam diameter on recording materials, and is used for carrying out the engraving till first degree of depth with first pel spacing irradiation recording materials; Second irradiation means, it penetrates second laser beam, this second laser beam has second beam diameter also bigger than above-mentioned first beam diameter on recording materials, and be used for carrying out the engraving till second degree of depth also darker than above-mentioned first degree of depth with second pel spacing irradiation recording materials also bigger than above-mentioned first pel spacing; First sweep mechanism, it makes from first laser beam of above-mentioned first irradiation means irradiation with from the axis direction synchronous scanning at above-mentioned recording drum of second laser beam of above-mentioned second irradiation means irradiation; Second sweep mechanism, it makes from first laser beam of above-mentioned first irradiation means irradiation and scans at the axis direction of above-mentioned recording drum with above-mentioned second pel spacing on recording materials.

By the automatic platemaker of this galley, can carve accurate image at high speed.

One preferred embodiment in, with above-mentioned first laser beam the scan frequency of the axis direction of above-mentioned recording drum be made as F1, with the modulating frequency of the above-mentioned second modulation mechanism be made as F2, will above-mentioned first pel spacing be made as pp, when above-mentioned second pel spacing is made as pc, the satisfied following formula of the automatic platemaker of galley.

F1＝F2·(pc/pp)。

And then the present invention is from other viewpoint, and the automatic platemaker of galley has: the recording drum of recording materials being installed and being rotated at its peripheral part; First LASER Light Source, it penetrates first laser beam, and this first laser beam has first beam diameter on recording materials, and is used for carrying out the engraving till first degree of depth with first pel spacing irradiation recording materials; Second LASER Light Source, it penetrates second laser beam, this second laser beam has second beam diameter also bigger than above-mentioned first beam diameter on recording materials, and be used for carrying out the engraving till second degree of depth also darker than above-mentioned first degree of depth with second pel spacing irradiation recording materials also bigger than above-mentioned first pel spacing; The first modulation mechanism, it modulates first laser beam; Deflector, it scans first laser beam by the modulation of the above-mentioned first modulation mechanism at the axis direction of above-mentioned recording drum with above-mentioned second pel spacing on recording materials; The second modulation mechanism, second laser beam that its modulation is penetrated by above-mentioned second LASER Light Source; Combination mechanism, it is synthetic by first laser beam of above-mentioned deflector and second laser beam of being modulated by the above-mentioned second modulation mechanism; Optical system, they will be by synthetic first laser beam of above-mentioned combination mechanism and second laser beam condensation on recording materials; Sweep mechanism, its make by above-mentioned optical system optically focused on recording materials first laser beam and second laser beam in the axis direction synchronous scanning of above-mentioned recording drum.

In addition, the automatic platemaker of a kind of galley of the present invention is characterized in that, has: the recording drum of recording materials being installed and being rotated at its peripheral part; First irradiation means, first laser beam of first beam diameter that it can be carved with first pel spacing recording materials irradiations is carved till first degree of depth; Second irradiation means, it penetrates second laser beam, this second laser beam has second beam diameter bigger than above-mentioned first beam diameter on recording materials, and, carve till second degree of depth darker than above-mentioned first degree of depth with second pel spacing irradiation recording materials bigger than above-mentioned first pel spacing; First sweep mechanism, it makes from first laser beam of above-mentioned first irradiation means irradiation with from the axis direction synchronous scanning at above-mentioned recording drum of second laser beam of above-mentioned second irradiation means irradiation; Second sweep mechanism, it makes first laser beam from the irradiation of above-mentioned first irradiation means in the enterprising line scanning of the axis direction of above-mentioned recording drum, utilizes the engraving of the above-mentioned first laser beam executive logging material in the above-mentioned second pel spacing scope thus on recording materials.

In addition, the automatic platemaker of a kind of galley of the present invention is characterized in that, has: the recording drum of recording materials being installed and being rotated at its peripheral part; First LASER Light Source, it penetrates first laser beam, and this first laser beam has first beam diameter on recording materials, and with first pel spacing irradiation recording materials, carves till first degree of depth; Second LASER Light Source, it penetrates second laser beam, this second laser beam has second beam diameter bigger than above-mentioned first beam diameter on recording materials, and, carve till second degree of depth darker than above-mentioned first degree of depth with second pel spacing irradiation recording materials bigger than above-mentioned first pel spacing; The first modulation mechanism, it modulates above-mentioned first laser beam; Deflector, it makes first laser beam of being modulated by the above-mentioned first modulation mechanism in the enterprising line scanning of the axis direction of above-mentioned recording drum, utilizes the engraving of the above-mentioned first laser beam executive logging material in the above-mentioned second pel spacing scope thus on recording materials; The second modulation mechanism, second laser beam that its modulation is penetrated by above-mentioned second LASER Light Source; Combination mechanism, it is synthetic by first laser beam of above-mentioned deflector and second laser beam of being modulated by the above-mentioned second modulation mechanism; Optical system, they will be by synthetic first laser beam of above-mentioned combination mechanism and second laser beam condensation on recording materials; Sweep mechanism, its make by above-mentioned optical system optically focused on recording materials first laser beam and second laser beam in the axis direction synchronous scanning of above-mentioned recording drum.

In addition, the automatic platemaker of a kind of galley of the present invention is characterized in that, has: the recording drum of recording materials being installed and being rotated at its peripheral part; LASER Light Source; Optical splitter, it will be separated into first laser beam and second laser beam from the laser beam that above-mentioned LASER Light Source penetrates; Beam diameter change mechanism, it changes the beam diameter of at least one laser beam in above-mentioned first laser beam or above-mentioned second laser beam; The first modulation mechanism, it modulates above-mentioned first laser beam; Deflector, it makes first laser beam by the modulation of the above-mentioned first modulation mechanism scan at the axis direction of above-mentioned recording drum; The second modulation mechanism, it modulates second laser beam; Combination mechanism, it is synthetic by first laser beam of above-mentioned deflector and second laser beam of being modulated by the above-mentioned second modulation mechanism; Optical system, it makes by synthetic first laser beam of above-mentioned combination mechanism and second laser beam condensation on recording materials; Sweep mechanism, its make by above-mentioned optical system optically focused on recording materials first laser beam and second laser beam in the axis direction synchronous scanning of above-mentioned recording drum, thereby, above-mentioned first laser beam has first beam diameter on recording materials, and, carve till first degree of depth with first pel spacing irradiation recording materials; Above-mentioned second laser beam has second beam diameter bigger than above-mentioned first beam diameter on recording materials, and with the second pel spacing irradiation recording materials bigger than above-mentioned first pel spacing, carve till second degree of depth darker than above-mentioned first degree of depth, above-mentioned deflector utilizes the engraving of the above-mentioned first laser beam executive logging material in the above-mentioned second pel spacing scope thus by making first laser beam of being modulated by the above-mentioned first modulation mechanism in the enterprising line scanning of the axis direction of above-mentioned recording drum on recording materials.

In addition, the automatic platemaker of a kind of galley of the present invention is characterized in that, has: the recording drum of recording materials being installed and being rotated at its peripheral part; First LASER Light Source, it penetrates first laser beam, and this first laser beam has first beam diameter on recording materials, and with first pel spacing irradiation recording materials, carves till first degree of depth; Second LASER Light Source, it penetrates second laser beam, this second laser beam has second beam diameter bigger than above-mentioned first beam diameter on recording materials, and, carve till second degree of depth darker than above-mentioned first degree of depth with second pel spacing irradiation recording materials bigger than above-mentioned first pel spacing; Deflector, it makes first laser beam of being modulated by the first modulation mechanism in the enterprising line scanning of the axis direction of above-mentioned recording drum, on recording materials, utilize the engraving of the above-mentioned first laser beam executive logging material in the above-mentioned second pel spacing scope thus, wherein, this first modulation mechanism is used to modulate first laser beam that is penetrated by above-mentioned first LASER Light Source; First optical system, it makes first laser beam condensation that is changed by above-mentioned deflector on recording materials; The second modulation mechanism, second laser beam that its modulation is penetrated by above-mentioned second LASER Light Source; Second optical system, it makes second laser beam condensation of having been modulated by the above-mentioned second modulation mechanism on recording materials; Sweep mechanism, its make by above-mentioned first optical system optically focused first laser beam on the recording materials and by above-mentioned second optical system second laser beam of optically focused on recording materials in the axis direction synchronous scanning of above-mentioned recording drum.

Relevant technical characterictic of the present invention, effect etc. can further be understood by following detailed description.

Description of drawings

Fig. 1 is the synoptic diagram of laser engraving machine.

Fig. 2 is the block diagram of wanting portion of expression laser engraving machine.

Fig. 3 A is the key diagram that schematically shows the shape on flexible photoreceptor material 10 surfaces.

Fig. 3 B is the key diagram that schematically shows the shape on flexible photoreceptor material 10 surfaces.

Fig. 3 C is the key diagram that schematically shows the shape on flexible photoreceptor material 10 surfaces.

Fig. 4 is the key diagram of expression embossment shape.

Fig. 5 is the key diagram that expression accurate engraving light beam L1 and roughhew are carved the employed signal of scanning of light beam L2.

Fig. 6 is the key diagram that expression accurate engraving light beam L1 and roughhew are carved the employed signal of scanning of light beam L2.

Fig. 7 is the flow chart of expression plate-making process.

Fig. 8 is the flow chart of the operation that comprised of description of step S7.

Fig. 9 is the stereogram that schematically shows the situation of engraving.

Figure 10 is the key diagram that schematically shows the situation of engraving.

Figure 11 is the key diagram that schematically shows the method for making of embossment data.

Figure 12 is the synoptic diagram of the laser engraving machine of second embodiment of the invention.

Figure 13 is the synoptic diagram of the laser engraving machine of second embodiment of the invention.

The specific embodiment

Below, based on the description of drawings embodiment of the present invention.Fig. 1 is the synoptic diagram as the laser engraving machine of the automatic platemaker of galley of the present invention, Fig. 2 be the expression its want the block diagram of portion.

This laser engraving machine has recording drum 11 and record head 20, installs as the flexible direct exposure material (hereinafter referred to as " flexible photoreceptor material ") 10 of relief printing plate with recording materials at the peripheral part of recording drum 11; Record head 20 constitutes in the direction parallel with the axis of this recording drum 11 with can move freely.

Record head 20 has: first LASER Light Source 21, and it penetrates the precision engraving light beam L1 as first laser beam; As the AOM (acousto-optic modulator) 22 of the first modulation mechanism, it is used to modulate this precision engraving light beam L1; AOD (acousto-optic deflection device) 23, it makes by the precision of AOM22 modulation and carves light beam L1 in the enterprising line scanning of the axis direction of recording drum 11; Second LASER Light Source 24, it penetrates as the roughhew of second laser beam and carves light beam L2; As the AOM25 of the second modulation mechanism, it is used to modulate roughhew and carves light beam L2; Beam synthesis 27, its synthetic accurate engraving light beam L1 and roughhew are carved light beam L2; Optical system 26, it makes by beam synthesis 27 synthetic precision engraving light beam L1 and roughhews and carves light beam L2 optically focused on flexible photoreceptor material 10.In addition, AOM22 and AOD23 also can be made of 1 element.

This record head 20 is by the guiding of not shown guide, and the relative record cylinder 11 thus, can with the direction of the axis parallel of recording drum 11 on move freely.And this record head 20 is subjected to the driving of the not shown ball-screw that rotates by not shown mobile motor, moves back and forth in the direction with the axis parallel of recording drum 10.Above-mentioned mobile motor is accepted rotary speed instruction and is rotated from control part 70.The translational speed of mobile record head 20 and shift position are measured by the not shown encoder that is connected with mobile motor by mobile motor, and this information is sent to control part 70.

As first LASER Light Source 21, adopt the light source of beam diameter with the accurate engraving of optimum conduct light beam L1, as second LASER Light Source 24, adopt to have the optimum light source of carving the beam diameter of light beam L2 as roughhew.But also can use optical beam expander etc., and the beam diameter of the laser beam that will penetrate from first, second LASER Light Source changes to only value.

As beam synthesis 27, can use the dichronic mirror of the difference of wavelength of having utilized first LASER Light Source 21 and second LASER Light Source 24 or utilize the polarizing beam splitter of difference of the polarization direction of first LASER Light Source 21 and second LASER Light Source 24.In addition, when the output of laser beam has surplus, can use semi-transparent semi-reflecting lens etc. as beam synthesis 27.

As shown in Figure 2, this laser engraving machine has the control part 70 of the whole device of control.This control part 70 is connected with personal computer 71 as input and output portion and display part.

Recording drum 11 shown in Figure 1 is connected with rotation motor 72 shown in Figure 2, and is center rotation with its axis.This rotation motor 72 is accepted rotary speed instruction and rotation from control part 70.The rotary angle position of the rotary speed of rotation motor 72 and the recording drum 11 that rotate by rotation motor 72 is by encoder 73 mensuration, and this information is sent to control part 70.

Record head 20 shown in Figure 1 be can move freely on the direction parallel with the axis of recording drum 11 thus by not shown guide guiding.And this record head 20 is provided with abreast with the axis of recording drum 11, and is subjected to the driving of the not shown ball-screw that rotates by mobile motor 74 shown in Figure 2, and moves back and forth on the direction parallel with the axis of recording drum 11.This mobile motor 74 is accepted rotary speed from control part 70 and is instructed and be rotated.The position of the rotary speed of mobile motor 74 and the record head 20 that moves by mobile motor 74 is by encoder 75 mensuration, and this information sends to control part 70.

First LASER Light Source 21 is connected with control part 70 via laser driver 61.In addition, AOM22 is connected with control part 70 via AOM driver 62.And then AOD23 is connected with control part 70 via AOD driver 63.Equally, second LASER Light Source 24 is connected with control part 70 via laser driver 64.In addition, AOM25 is connected with control part 70 via AOM driver 66.

In this laser engraving machine, modulated from the precision engraving light beam L1 that first LASER Light Source 21 penetrates at AOM22, after AOD23 is scanned along the axis direction of recording drum 11, incide laser synthesizer 27.On the other hand, carve light beam L2 after AOM25 is modulated, incide beam synthesis 27 from the roughhew that second LASER Light Source 24 penetrates.And accurate engraving light beam L1 and roughhew are carved light beam L2 after beam synthesis 27 is synthesized, via optical system 26 optically focused on flexible photoreceptor material 10.

And, driving by mobile motor 74 is moved record head 20 on the direction parallel with the axis of recording drum 11, make optically focused carve the axis direction synchronous scanning of light beam L2, carry out the engraving of galley at recording drum 11 to precision engraving light beam L1 and roughhew on the flexible photoreceptor material 10 by optical system 26.

At this moment, in this laser engraving machine, carry out simultaneously: accurate engraving, its use has the precision engraving light beam L1 of less beam diameter, with precision engraving pel spacing pp irradiation flexible photoreceptor material 10, carve, till the depth capacity dp of precision engraving light beam L1; Roughhew is carved, and its use has the roughhew of big beam diameter and carves light beam L2, with roughhew imagery plain spacing pc (equal site spacing) the irradiation flexible photoreceptor material 10 bigger than precision engraving pel spacing pp, carves, till relief depth d.Thus, shorten the plate-making time.

In addition, as first LASER Light Source 21, can use near infrared YAG laser instrument of irradiation and optical fiber laser etc.As first LASER Light Source 21, when using this LASER Light Source, because the wavelength of laser beam is about 1 μ m, so can make the final spot diameter of the laser beam when carving minimum.At this moment,, need not very large energy, and the light source that does not need to use high output is as first LASER Light Source 21, so that the price of first LASER Light Source 21 can not become is very high in order to carry out the precision engraving of carving till the depth capacity dp.

As second LASER Light Source 24, use for example carbon dioxide laser.As second LASER Light Source 24, when using this LASER Light Source, the price comparison of LASER Light Source is cheap, more can access high outgoing laser beam.At this moment, carve in order to carry out the roughhew of carving relief depth d, owing to can use the laser beam of bigger beam diameter, so can not produce the problem that can not carry out the engraving of high-res.

Fig. 3 A, Fig. 3 B, Fig. 3 C schematically show the key diagram that uses this laser engraving machine to carry out the shape on flexible photoreceptor material 10 surfaces after carving.In addition, Fig. 3 A is the vertical view of 7 embossments forming along main scanning direction on flexible photoreceptor material 10, and Fig. 3 B is its profile.In addition, in the figure, for convenience of explanation, expression forms and to begin the situation that dot area percentage is 7 embossments of 0%, 1%, 1%, 2%, 2%, 0%, 0% from the left side of this figure.

As shown in the drawing, for the precision engraving, use precision engraving light beam L1 with less beam diameter.And, should precision engraving light beam L1 be radiated on the flexible photoreceptor material 10 with precision engraving pel spacing pp, flexible photoreceptor material 10 is begun to carve depth capacity dp from its surface till.

When the very little embossment of dot area percentage was adjacent to each other, this depth capacity dp was consistent with the carving depth of the boundary member of these embossments.Than the carving depth of boundary member hour, can not show small site at this depth capacity dp preferably.Can make this depth capacity dp bigger, but carving efficiency worsen than the carving depth of boundary member.In this embodiment, be 1% embossment when being connected to each other at dot area percentage, the carving depth of these embossment boundary members is set at depth capacity dp.

In this precision engraving, the engraving of part till carrying out from flexible photoreceptor material 10 surfaces to depth capacity dp, that the shape of site is directly influenced.Therefore,, adopt smaller precision engraving pel spacing pp,, carry out the engraving of small unit as schematically showing at Fig. 3 C as the engraving pel spacing of this moment.The beam diameter of the precision engraving light beam L1 of this moment adopts the less beam diameter of the engraving that can carry out accurate engraving pel spacing pp.

With the precision engraving while, carry out roughhew and carve.In this roughhew is carved, use roughhew to carve light beam L2 with big beam diameter.And, this roughhew is carved light beam L2 is radiated on the flexible photoreceptor material 10 with the plain spacing pc of roughhew imagery, flexible photoreceptor material 10 is begun to carve relief depth d from above-mentioned depth capacity dp till.Like this, owing to carved once more quarter by roughhew in the zone that the precision engraving is carved, the relief depth d that begins from flexible photoreceptor material 10 that accurate engraving of execution and roughhew are carved afterwards is bigger than the depth capacity dp of accurate engraving.In this roughhew is carved, owing to carry out the engraving of the part that the shape to the site directly do not influence, so the plain spacing pc of roughhew imagery can be made bigger spacing.This when considering the order at accurate engraving and roughhew quarter conversely too.

As the plain spacing pc of the roughhew imagery of this moment, can adopt site spacing w.The plain spacing pc of this roughhew imagery can at random set in more than or equal to above-mentioned precision engraving pel spacing pp, smaller or equal to the scope of site spacing w.Wherein, more the plain spacing pc of roughhew imagery just can be raised the efficiency more near site spacing w.

Fig. 4 is a key diagram of representing flexible photoreceptor material 10 formed embossment shapes more accurately.

Parameter as expression embossment shape has embossment angle θ, relief depth d, is used to constitute contract the pitch dt and the horizontal part wt of top T.Embossment angle θ is shared value in all embossments.Relief depth d is to be the carving depth in zero zone at site percentage.In addition, pitch dt is provided with in order to improve site revisal (dot gain), and horizontal part wt is provided with for the mechanical strength that increases embossment, and when top T itself was not contracted in formation, the value of pitch dt and horizontal part wt was 0.In the above description, describe at the situation of having omitted pitch dt and horizontal part wt.

In addition, when using embossment shape shown in Figure 4, above-mentioned depth capacity dp can calculate with following formula (1).

dp＝(2 ^1/2·pc/2-wt)tan(θπ/180)+dt …(1)

In addition, when top T self is not contracted in formation, can be in pitch dt and horizontal part wt substitution zero.

But, carrying out accurate engraving and roughhew at the same time during quarter, need in above-mentioned precision engraving, carve with precision engraving pel spacing pp, in carving, carves roughhew with the plain spacing pc of roughhew imagery.But, adopting by record head 20 is moved, make accurate engraving light beam L1 and roughhew carve light beam L2 synchronously when the structure of the axis direction scanning of recording drum 11, at the axis direction of recording drum 11, the engraving pel spacing is necessarily identical usually.Therefore, in laser engraving machine of the present invention, adopt following structure: make accurate engraving light beam L1 and roughhew carve light beam L2, accurate engraving light beam L1 is scanned at sub scanning direction (axis direction of recording drum 11) with the plain spacing pc of roughhew imagery on flexible photoreceptor material 10 synchronously in main scanning direction (circumferencial direction of recording drum 11) scanning.

Describe at this structure below.Fig. 5 and Fig. 6 are the key diagrams that is illustrated in the employed signal of scanning of accurate engraving light beam L1 and roughhew light beam L2 at quarter.In addition.Fig. 6 is the enlarged drawing of the part of amplification presentation graphs 5.

Here, Fig. 5 and arrow s1 shown in Figure 6 represent main scanning direction.Accurate engraving light beam L1 and roughhew are carved the rotation that light beam L2 is accompanied by recording drum 11, scan at the main scanning direction s1 along the periphery of recording drum 11.In addition, arrow s2 vice scanning direction shown in Figure 5.Accurate engraving light beam L1 is by AOD23 deflection, scans at the sub scanning direction s2 towards the axis direction of recording drum 11.In addition, in these figure, pc represents the plain spacing of above-mentioned roughhew imagery, and pp represents accurate engraving pel spacing, and in addition, t represents the deflection cycle of AOD23.

At the defection signal shown in these figure is employed signal by the accurate engraving of AOD23 deflection light beam L1 the time.Accurate engraving light beam L1 scans at the sub scanning direction s2 towards the axis direction of recording drum 11 with precision engraving pel spacing pp on flexible photoreceptor material 10 by this modulation signal.At this moment, when the modulating frequency with first modulation signal is made as F2, the formula below the frequency F1 of this defection signal satisfies.

F1＝F2·(pc/pp)

In addition, be the signal that is used for carving light beam L2 for roughhew carves at first modulation signal shown in these figure by AOM25 modulation roughhew.Roughhew is carved light beam L2 by this change open and close of first modulation signal and its intensity.Equally, second modulation signal shown in these figure is the signal that is used for by the accurate engraving of AOM22 modulation light beam L1.Accurate engraving light beam L1 is by this change open and close of second modulation signal and its intensity.

When adopting this structure, accurate engraving light beam L1 is carrying out engraving with precision engraving pel spacing pp in the rotation that is accompanied by recording drum 11 in the scanning of main scanning direction s1, the deflection action of simultaneous AOD23, on flexible photoreceptor material 10, in the scope of the plain spacing pc of roughhew imagery, in the scanning of sub scanning direction s2, carrying out engraving with precision engraving pel spacing pp.On the other hand, roughhew is carved the rotation that light beam L2 is accompanied by recording drum 11, is carrying out engraving with the plain spacing pc of roughhew imagery in the scanning of main scanning direction s1.

Thus, even adopting by record head 20 being moved make accurate engraving light beam L1 and roughhew to carve light beam L2 synchronously during structure in the axis direction scanning of recording drum 11, accurate engraving light beam L1 and roughhew are carved light beam L2 also can carry out engraving with the pel spacing of necessity respectively, can carve accurate image at high speed.

Then, describe at the plate-making process that uses this laser engraving machine to carve the flexible photoreceptor material 10 of flexible photoreceptor material 10.Fig. 7 is the flow chart of expression plate-making process.

When carrying out the plate-making of flexible printing plate, initial manipulation person specifies embossment shape and screen density (step S1), and this embossment shape and screen density are transfused to from personal computer 71, and are sent to control part 70.

Then, from preassigned screen density decision site spacing w (step S2).This site spacing is the inverse of screen density.

Then, the depth capacity dc (step S3) that carves of the depth capacity dp of the accurate engraving of computing and roughhew.This computing uses above-mentioned formula (1) to carry out.

Then, the operator specifies resolution (step S4).This resolution is from for example selecting 1200dpi, 2400dpi, the 4000dpi.

Then, the resolution from appointment decides accurate engraving pel spacing pp (step S5).In addition, adjust the beam and focus size of accurate engraving light beam L1, the width of the sub scanning direction of feasible accurate engraving pel spacing pp and accurate engraving light beam L1 is approaching consistent.

In addition, the plain spacing pc (step S6) of the roughhew imagery of roughhew during quarter is carried out in decision.Plain spacing pc is consistent with site spacing w as mentioned above for this roughhew imagery.

Sweep speed (step S7) when then, decision is carved.

When carrying out precision engraving operation and roughhew operation at quarter respectively, the engraving sensitivity that can change based on beam diameter by laser beam, at the pel spacing of each engraving and the carving depth of corresponding embossment shape of in each engraving, being carved and the laser beam power that is given, decision is in the sweep speed of each engraving operation.

With respect to this, in the present embodiment, carry out precision engraving operation and roughhew simultaneously and carve operation, make the scanning of accurate engraving light beam L1 and the scan-synchronized that roughhew is carved light beam L2 simultaneously.Therefore in the present embodiment, according to these laser beams, at first determine the laser beam power ratio that can carry out synchronous scanning.And the laser beam power of roughhew being carved light beam is as giving condition, from above-mentioned laser beam power than the laser beam power that decides accurate engraving light beam.

Then, decision can be carried out the precision engraving of synchronous scanning and the sweep speed ratio that roughhew is carved.And, based on roughhew carve light beam L2 laser beam power, corresponding to roughhew carve the beam diameter of light beam L2 engraving sensitivity, need in the standard time, carve the volume of the flexible photoreceptor material of removing by roughhew, calculate roughhew and carve light beam L2 in sweep speed along the direction of main scanning direction S1.

And, be used in above-mentioned sweep speed ratio by this roughhew being carved light beam L2 at sweep speed v2 along the direction of main scanning direction S1, calculate accurate engraving light beam L1 at sweep speed v1 along the direction of sub scanning direction S2.

Below, use the flow chart of Fig. 8 to illustrate in greater detail.In addition, Fig. 8 is the flow chart that illustrates in greater detail each operation that step 7 comprised of Fig. 7.

At first, calculate the engraving sensitivity sp (step S7-1) that carves the beam diameter of light beam L1 corresponding to precision.At this, engraving sensitivity sp uses the value divided by the ENERGY E of laser beam by the volume V of laser beam engraving.In addition, the ENERGY E of laser beam is the power of LASER Light Source 21 and the value that irradiation time multiplies each other.Engraving sensitivity during engraving flexible photoreceptor material 10 changes according to beam diameter.Therefore, making is in advance carved the form of sensitivity one to one with the beam diameter of each laser beam or is obtained from beam diameter and ask for engraving Sensitivity calculation formula by experiment, be applicable in this form or the calculating formula by the beam diameter of precision being carved light beam L1, obtain engraving sensitivity sp.

Equally, obtain the engraving sensitivity sc (step S7-2) that carves the beam diameter of light beam L2 corresponding to roughhew.

The flexible photoreceptor material volume vp (step S7-3) that is carved in the time of till depth capacity dp when then, calculating is carved the precision engraving in the rectangular area that with four limits is the plain spacing pc of roughhew imagery.Four limits be the plain spacing pc of roughhew imagery the rectangular area as the decision laser beam power than and sweep speed than the time the benchmark area use.Fig. 9 is the stereogram that schematically shows the situation of engraving.Can be clear from this Fig. 9, the flexible photoreceptor material volume vp that carves by precision engraving light beam L1 is pc*pc*dp.

Equally, calculating four limits is flexible photoreceptor material volume vp (step S7-4) till the depth capacity dc when carving roughhew and carving of the rectangular area of the plain spacing pc of roughhew imagery the time.Flexible photoreceptor material volume vc is pc*pc* (d-dp).

Then, calculate energy needed (step S7-5) when being equivalent to the flexible photoreceptor material 10 of the flexible photoreceptor material volume vp that asked at step S7-3 with accurate engraving light beam L1 engraving.The value of engraving sensitivity sp when this equals flexible photoreceptor material volume vp and multiply by accurate engraving.

Equally, calculate energy needed (step S7-6) when carving light beam L2 engraving and be equivalent to the flexible photoreceptor material 10 of the flexible photoreceptor material volume vc that asked at step S7-4 with roughhew.This equals the value that flexible photoreceptor material volume vc multiply by the engraving sensitivity sc of roughhew during quarter.

But the energy that is applied to shone thing by laser beam equals irradiation time long-pending of the light beam power of laser beam and laser beam.That is:

E1＝PW1*t1 …(2)

E2＝PW2*t2 …(3)

Wherein, E1 is the energy value of accurate engraving light beam L1, and E2 is the energy value that roughhew is carved light beam L2, PW1 is the laser power of accurate engraving light beam L1, PW2 is the laser power that roughhew is carved light beam L2, and t1 is the scanning benchmark needed time of area, and t2 is the scanning benchmark needed time of area.

In the present embodiment, precision is carved and roughhew is carved owing to carry out synchronously, so accurate engraving light beam L1 scans the needed time t1 of benchmark area and the needed time t2 of roughhew light beam L2 at quarter scanning benchmark area equates.

Therefore, formula (2) and formula (3) can be rewritten as following formula (4).

E1/PW1＝E2/PW2＝t1＝t2 …(4)

In addition, when the said reference area being regarded as four limits and is the rectangular area of the plain spacing pc of roughhew imagery, since E1=vp*sp, E2=vc*sc, and then formula (4) can further be rewritten as formula (5).

vp*sp/PW1＝vc*sc/PW2 …(5)

In addition, precision is carved light beam power PW2 sum that the light beam power PW1 of light beam L1 and roughhew carve light beam L2 as total laser power and be made as pw.

By the above, the light beam power PW1 of accurate engraving light beam L1 becomes formula (6).

PW1＝pw*vp*sp/(vp*sp+vc*sc) …(6)

In addition, the light beam power PW2 of roughhew light beam L2 at quarter becomes formula (7).

PW2＝pw*vc*sc/(vp*sp+vc*sc) …(7)

In addition, during depth capacity dp when calculating accurate engraving based on formula (1), formula (6) can be transformed to following formula (8).At this, in following formula (8), (9), (2d α+4pc α+dpc β) is made as A.

$\mathrm{<figure-callout\; id="1"\; label="PW"\; filenames="C200610058884E00241.png,C200610058884E00251.png"\; state="\{\{state\}\}">PW</figure-callout>}1=$

$\frac{\{\mathrm{pc}\&CenterDot;\mathrm{pw}\&CenterDot;[4\&CenterDot;\mathrm{dt}\&CenterDot;\mathrm{\&alpha;}+4\&CenterDot;\mathrm{pp}\&CenterDot;\mathrm{\&alpha;}+2\&CenterDot;\mathrm{dt}\&CenterDot;\mathrm{\&beta;}+(\sqrt{2}\&CenterDot;\mathrm{pd}-2\&CenterDot;\mathrm{wt})\&CenterDot;(2\&CenterDot;\mathrm{\&alpha;}+\mathrm{pp}\&CenterDot;\mathrm{\&beta;})\&CenterDot;\mathrm{Tar}\left(\frac{\mathrm{\&pi;}\&CenterDot;\mathrm{\&theta;}}{180}\right)]\}}{\{2\&CenterDot;[2\&CenterDot;\mathrm{dt}\&CenterDot;(\mathrm{pc}-\mathrm{pp})\&CenterDot;\mathrm{\&alpha;}+\mathrm{pp}\&CenterDot;A+(\mathrm{pc}-\mathrm{pp})\&CenterDot;(\sqrt{2}\&CenterDot;\mathrm{pd}-2\&CenterDot;\mathrm{wt})\&CenterDot;\mathrm{\&alpha;}\&CenterDot;\mathrm{Tar}\left(\frac{\mathrm{\&pi;}\&CenterDot;\mathrm{\&theta;}}{180}\right)]\}}\&CenterDot;\&CenterDot;\&CenterDot;\left(8\right)$

Equally, formula (7) can be transformed into as follows formula (9).

$\mathrm{<figure-callout\; id="2"\; label="PW"\; filenames="C200610058884E00241.png,C200610058884E00251.png"\; state="\{\{state\}\}">PW</figure-callout>}2=$

$-\&lang;\frac{\{\mathrm{pc}\&CenterDot;\mathrm{pw}\&CenterDot;[4\&CenterDot;\mathrm{dt}\&CenterDot;\mathrm{\&alpha;}+4\&CenterDot;\mathrm{pp}\&CenterDot;\mathrm{\&alpha;}+2\&CenterDot;\mathrm{dt}\&CenterDot;\mathrm{\&beta;}+(\sqrt{2}\&CenterDot;\mathrm{pd}-2\&CenterDot;\mathrm{wt})\&CenterDot;(2\&CenterDot;\mathrm{\&alpha;}+\mathrm{pp}\&CenterDot;\mathrm{\&beta;})\&CenterDot;\mathrm{Tan}\left(\frac{\mathrm{\&pi;}\&CenterDot;\mathrm{\&theta;}}{180}\right)]\}}{\{2\&CenterDot;[2\&CenterDot;\mathrm{dt}\&CenterDot;(\mathrm{pc}-\mathrm{pp})\&CenterDot;\mathrm{\&alpha;}+\mathrm{pp}\&CenterDot;A+(\mathrm{pc}-\mathrm{pp})\&CenterDot;(\sqrt{2}\&CenterDot;\mathrm{pd}-2\&CenterDot;\mathrm{wt})\&CenterDot;\mathrm{\&alpha;}\&CenterDot;\mathrm{Tan}\left(\frac{\mathrm{\&pi;}\&CenterDot;\mathrm{\&theta;}}{180}\right)]\}}\&rang;\&CenterDot;\&CenterDot;\&CenterDot;\left(9\right)$

By above formula decision PW1 and PW2.

Then, the decision roughhew is carved sweep speed v2 and the accurate ratio (step S7-8) of carving light beam L1 along the sweep speed v1 of sub scanning direction S2 of light beam L2 along main scanning direction S1.

Consider that accurate engraving light beam L1 scanning benchmark area is that four limits are the needed time t1 in rectangular area (with reference to Figure 10) of the plain spacing pc of roughhew imagery.During this time t1, accurate engraving light beam L1 is the scan line of pc owing to needing scanning (pc/pp) bar length, so time t1 can represent with following formula (10).

t1＝(pc*pc/pp)/v1 …(10)

On the other hand, roughhew carve light beam L2 scanning benchmark area promptly four limits be that the needed time t2 in rectangular area of the plain spacing pc of roughhew imagery is as follows.

t2＝pc/v2 …(11)

Because accurate engraving and roughhew are carved synchronously and are carried out, so t1=t2.Therefore, formula (10) and formula (11) are out of shape as follows, decide the sweep speed ratio.

v1/v2＝pc/pp …(12)

Then, the formula (13) below the light beam power PW2 substitution of roughhew being carved light beam L2, thus the decision roughhew is carved the sweep speed v2 (step S7-9) of light beam L2.

V2＝PW2/vc*sc …(13)

And,, decide the sweep speed v1 (step S7-10) of accurate engraving light beam L1 by being used in formula (12) by the sweep speed v2 of following formula decision.

Then, make the embossment data (step S8) of the embossment shape that expression should carve from the view data that on flexible photoreceptor material 10, should form.Can be as the view data on basis by online or be transferred to control part 70 by personal computer 71 by off line.Based on this view data, make the embossment data.These embossment data are the data that make these embossment data overlapping, and the zone repeating mutually makes the more shallow data of the degree of depth more preferably.

Figure 11 is the key diagram that schematically shows the preparation method of embossment data.

The figure shows the state that forms embossment 1 and embossment 2.From the place that the rake of embossment 1 and embossment 2 contacts, the embossment data of embossment 1 are used in the zone of embossment 1 side, from the place that the rake of embossment 1 and embossment 2 contact, the embossment data of the zone use embossment 2 of embossment 2 sides.

Then, from the accurate multi-value data (step S9) of carving usefulness of embossment data creating.This multi-value data is to be the multi-value data that the engraving till the depth capacity dp is carried out in 0% zone to dot area percentage.This multi-value data is 0%～100% zone at dot area percentage, is made into the data that can form the rake of embossment as shown in Figure 3 step-likely.

Then, carve the multi-value data (step S10) of usefulness by embossment data creating roughhew.This multi-value data is by being that carve with carving depth dc in 0% zone to dot area percentage on the basis of having considered embossment angle θ, thereby finally carries out the multi-value data of the engraving of relief depth d.

And, carry out engraving (step S11).At this moment, control part 70 is according to sweep speed v1 control AOD23, simultaneously according to sweep speed v2 control rotation motor 72.Simultaneously to control AOM22,25 corresponding to the frequency of above-mentioned each sweep speed v1 and v2.In addition, control part 70 to be to light first LASER Light Source 21 corresponding to the power of light beam power PW1, simultaneously, and to light second LASER Light Source 24 corresponding to the power of light beam power PW2.And then control part 70 is to make record head 12 move at sub scanning direction with the synchronous speed of the rotary speed of recording drum 11.In addition, by control part 70 control AOD23, accurate engraving light beam L1 is scanned at sub scanning direction.And,, carry out necessary engraving by control part 70 control AOM drivers 66,62.

As mentioned above, according to the laser engraving machine of present embodiment, accurate engraving light beam L1 and roughhew are carved light beam L2 can carry out engraving with the pel spacing of necessity respectively, can carve accurate image at high speed.In addition, optical system shared 26 costs that can reduce device.

Then, describe at other embodiments of the present invention.Figure 12 is that the automatic platemaker of the galley of second embodiment of the invention is the synoptic diagram of laser engraving machine.

This laser engraving machine has the record head 30 that constitutes in the direction parallel with the axis of recording drum 11 with can move freely.

This record head 30 has: single LASER Light Source 31; Optical splitter 41, it will be separated into the first laser beam L1 and the second laser beam L2 from the laser beam that this LASER Light Source 31 penetrates; AOM32, it modulates first laser beam; AOD33, it makes first laser beam by the AOM32 modulation scan at the axis direction of recording drum 11; AOM34, it modulates second laser beam; Beam diameter change mechanism 36, its change is by the beam diameter of second laser beam of AOM34 modulation; A pair of folding mirror 42,43; Combination mechanism 44, it is synthetic by first laser beam of AOD33 deflection and second laser beam of being modulated by AOD34; Optical system 35, it makes first, second laser beam condensation that is synthesized by combination mechanism 44 on flexible photoreceptor material 10.The laser engraving machine of other structures and above-mentioned first embodiment is identical.

In this laser engraving machine, also making accurate engraving light beam L1 and roughhew carve light beam L2 by employing scans at main scanning direction synchronously, make the structure of accurate engraving light beam L1 simultaneously in sub scanning direction scanning, can carry out engraving with the pel spacing of necessity respectively thereby accurate engraving light beam L1 and roughhew are carved light beam L2, can carve accurate image at high speed.In addition, by using single LASER Light Source 31, can reduce the cost of device.

Then, describe at other embodiments of the present invention.Figure 13 is that the galley device of third embodiment of the invention is the synoptic diagram of laser engraving machine.

This laser engraving machine has the record head 50 that constitutes in the direction parallel with the axis of recording drum 11 with can move freely.

Record head 50 has: first LASER Light Source 51, and it penetrates first laser beam; AOM52, it modulates first laser beam; AOD53, it makes first laser beam by the AOM52 modulation scan at the axis direction of recording drum 11; Optical system 54, it makes first laser beam condensation by AOD53 deflection on flexible photoreceptor material 10; Second LASER Light Source 55, it penetrates second laser beam; Optical system 56, it makes second laser beam condensation on flexible photoreceptor material 10.

In addition, in the present embodiment, when carving, by lighting second laser beam continuously, and can make flexible photoreceptor material 10 have waste heat by first laser beam.At this moment, can promote the engraving that undertaken by first laser beam.

In the laser engraving machine of the 3rd embodiment, adopt following structure: first laser beam is modulated by AOM52, but second laser beam is not used AOM, by controlling second LASER Light Source 55, penetrates the second modulated laser beam from second LASER Light Source 55.

AOM usually can carry out the High Speed Modulation about 1MHz, but the transmitance of the laser beam of the employed germanium of AOM worsens, and laser beam produces the loss about a few percent in AOM.Therefore, in the roughhew that does not need High Speed Modulation is carved, carve at second LASER Light Source 55 self modulating lasering beam, if in the precision engraving, carve from first LASER Light Source, the 51 continuous laser beams that penetrate by the AOM52 modulation, then can when roughhew is carved, use laser beam effectively.This to the first above-mentioned embodiment 1 too.

In this laser engraving machine, also making accurate engraving light beam L1 and roughhew carve light beam L2 by employing scans at main scanning direction synchronously, make the structure of accurate engraving light beam L1 simultaneously in sub scanning direction scanning, can carry out engraving with the pel spacing of necessity respectively thereby accurate engraving light beam L1 and roughhew are carved light beam L2, can carve accurate image at high speed.In addition, can corresponding each LASER Light Source, select suitable optical system 54,56.

In addition, in the above-described embodiment, each LASER Light Source is configured on each record head, but also can be by LASER Light Source is configured in apparatus main body, to be radiated at folding mirror that is configured on the record head etc. from the laser beam that LASER Light Source penetrates, thereby make the record head miniaturization.

In addition, in the above-described embodiment, it is that the flexible photoreceptor material is as recording materials that any embodiment can use one of relief printing plate.But the present invention is the situation when by laser engraving the recording materials of intaglio printing plates such as intaglio plate being formed recess also.

The foregoing description only is used to illustrate preferred embodiment of the present invention; but not being used to limit the present invention, those skilled in the art can carry out the replacement of suitable change according to of the present invention open; in the scope that does not break away from spirit of the present invention, all be included in protection domain of the present invention.

Claims (13)

1. the automatic platemaker of a galley is characterized in that, has:

The recording drum of recording materials being installed and being rotated at its peripheral part;

First irradiation means, first laser beam of first beam diameter that it can be carved with first pel spacing recording materials irradiations is carved till first degree of depth;

Second irradiation means, it penetrates second laser beam, this second laser beam has second beam diameter bigger than above-mentioned first beam diameter on recording materials, and, carve till second degree of depth darker than above-mentioned first degree of depth with second pel spacing irradiation recording materials bigger than above-mentioned first pel spacing;

First sweep mechanism, it makes from first laser beam of above-mentioned first irradiation means irradiation with from the axis direction synchronous scanning at above-mentioned recording drum of second laser beam of above-mentioned second irradiation means irradiation;

Second sweep mechanism, it makes first laser beam from the irradiation of above-mentioned first irradiation means in the enterprising line scanning of the axis direction of above-mentioned recording drum, utilizes the engraving of the above-mentioned first laser beam executive logging material in the above-mentioned second pel spacing scope thus on recording materials.

2. the automatic platemaker of galley as claimed in claim 1 is characterized in that,

Above-mentioned first laser beam is being made as F1 towards the frequency of the axis direction of above-mentioned recording drum scanning, above-mentioned second laser beam is made as F2 towards the frequency of the axis direction of above-mentioned recording drum scanning, above-mentioned first pel spacing is made as pp, when above-mentioned second pel spacing is made as pc, the formula below satisfying:

F1＝F2·(pc/pp)。

3. the automatic platemaker of a galley is characterized in that, has:

The recording drum of recording materials being installed and being rotated at its peripheral part;

First LASER Light Source, it penetrates first laser beam, and this first laser beam has first beam diameter on recording materials, and with first pel spacing irradiation recording materials, carves till first degree of depth;

Second LASER Light Source, it penetrates second laser beam, this second laser beam has second beam diameter bigger than above-mentioned first beam diameter on recording materials, and, carve till second degree of depth darker than above-mentioned first degree of depth with second pel spacing irradiation recording materials bigger than above-mentioned first pel spacing;

The first modulation mechanism, it modulates above-mentioned first laser beam;

Deflector, it makes first laser beam of being modulated by the above-mentioned first modulation mechanism in the enterprising line scanning of the axis direction of above-mentioned recording drum, utilizes the engraving of the above-mentioned first laser beam executive logging material in the above-mentioned second pel spacing scope thus on recording materials;

The second modulation mechanism, second laser beam that its modulation is penetrated by above-mentioned second LASER Light Source;

Combination mechanism, it is synthetic by first laser beam of above-mentioned deflector and second laser beam of being modulated by the above-mentioned second modulation mechanism;

Optical system, they will be by synthetic first laser beam of above-mentioned combination mechanism and second laser beam condensation on recording materials;

Sweep mechanism, its make by above-mentioned optical system optically focused on recording materials first laser beam and second laser beam in the axis direction synchronous scanning of above-mentioned recording drum.

4. the automatic platemaker of galley as claimed in claim 3 is characterized in that, above-mentioned first modulation mechanism and the above-mentioned second modulation mechanism are modulator.

5. the automatic platemaker of galley as claimed in claim 3 is characterized in that, the above-mentioned first modulation mechanism is a modulator, and the above-mentioned second modulation mechanism is by controlling the mechanism that second LASER Light Source makes second laser beam that second LASER Light Source penetrates modulated.

6. the automatic platemaker of galley as claimed in claim 3 is characterized in that,

Above-mentioned first laser beam is being made as F1 towards the frequency of the axis direction of above-mentioned recording drum scanning, the modulating frequency of the above-mentioned second modulation mechanism is made as F2, above-mentioned first pel spacing is made as pp, when above-mentioned second pel spacing is made as pc, the formula below satisfying:

F1＝F2·(pc/pp)。

7. the automatic platemaker of a galley is characterized in that, has:

The recording drum of recording materials being installed and being rotated at its peripheral part;

LASER Light Source;

Optical splitter, it will be separated into first laser beam and second laser beam from the laser beam that above-mentioned LASER Light Source penetrates;

Beam diameter change mechanism, it changes the beam diameter of at least one laser beam in above-mentioned first laser beam or above-mentioned second laser beam;

The first modulation mechanism, it modulates above-mentioned first laser beam;

Deflector, it makes first laser beam by the modulation of the above-mentioned first modulation mechanism scan at the axis direction of above-mentioned recording drum;

The second modulation mechanism, it modulates second laser beam;

Combination mechanism, it is synthetic by first laser beam of above-mentioned deflector and second laser beam of being modulated by the above-mentioned second modulation mechanism;

Optical system, it makes by synthetic first laser beam of above-mentioned combination mechanism and second laser beam condensation on recording materials;

Sweep mechanism, its make by above-mentioned optical system optically focused on recording materials first laser beam and second laser beam in the axis direction synchronous scanning of above-mentioned recording drum,

Thereby above-mentioned first laser beam has first beam diameter on recording materials, and with first pel spacing irradiation recording materials, carves till first degree of depth;

Above-mentioned second laser beam has second beam diameter bigger than above-mentioned first beam diameter on recording materials, and with the second pel spacing irradiation recording materials bigger than above-mentioned first pel spacing, carve till second degree of depth darker than above-mentioned first degree of depth

Above-mentioned deflector utilizes the engraving of the above-mentioned first laser beam executive logging material in the above-mentioned second pel spacing scope thus by making first laser beam of being modulated by the above-mentioned first modulation mechanism in the enterprising line scanning of the axis direction of above-mentioned recording drum on recording materials.

8. the automatic platemaker of galley as claimed in claim 7 is characterized in that, above-mentioned first modulation mechanism and the above-mentioned second modulation mechanism are modulator.

9. the automatic platemaker of galley as claimed in claim 7 is characterized in that,

Above-mentioned first laser beam is being made as F1 towards the frequency of the axis direction of above-mentioned recording drum scanning, the modulating frequency of the above-mentioned second modulation mechanism is made as F2, above-mentioned first pel spacing is made as pp, when above-mentioned second pel spacing is made as pc, the formula below satisfying:

F1＝F2·(pc/pp)。

10. the automatic platemaker of a galley is characterized in that, has:

The recording drum of recording materials being installed and being rotated at its peripheral part;

First LASER Light Source, it penetrates first laser beam, and this first laser beam has first beam diameter on recording materials, and with first pel spacing irradiation recording materials, carves till first degree of depth;

Second LASER Light Source, it penetrates second laser beam, this second laser beam has second beam diameter bigger than above-mentioned first beam diameter on recording materials, and, carve till second degree of depth darker than above-mentioned first degree of depth with second pel spacing irradiation recording materials bigger than above-mentioned first pel spacing;

Deflector, it makes first laser beam of being modulated by the first modulation mechanism in the enterprising line scanning of the axis direction of above-mentioned recording drum, on recording materials, utilize the engraving of the above-mentioned first laser beam executive logging material in the above-mentioned second pel spacing scope thus, wherein, this first modulation mechanism is used to modulate first laser beam that is penetrated by above-mentioned first LASER Light Source;

First optical system, it makes first laser beam condensation that is changed by above-mentioned deflector on recording materials;

The second modulation mechanism, second laser beam that its modulation is penetrated by above-mentioned second LASER Light Source;

Second optical system, it makes second laser beam condensation of having been modulated by the above-mentioned second modulation mechanism on recording materials;

Sweep mechanism, its make by above-mentioned first optical system optically focused first laser beam on the recording materials and by above-mentioned second optical system second laser beam of optically focused on recording materials in the axis direction synchronous scanning of above-mentioned recording drum.

11. the automatic platemaker of galley as claimed in claim 10 is characterized in that, above-mentioned first modulation mechanism and the above-mentioned second modulation mechanism are modulator.

12. the automatic platemaker of galley as claimed in claim 10, it is characterized in that, the above-mentioned first modulation mechanism is a modulator, and the above-mentioned second modulation mechanism is by controlling the mechanism that second LASER Light Source makes second laser beam that second LASER Light Source penetrates modulated.

13. the automatic platemaker of galley as claimed in claim 10 is characterized in that,

Above-mentioned first laser beam is being made as F1 towards the frequency of the axis direction of above-mentioned recording drum scanning, the modulating frequency of the above-mentioned second modulation mechanism is made as F2, above-mentioned first pel spacing is made as pp, when above-mentioned second pel spacing is made as pc, the formula below satisfying:

F1＝F2·(pc/pp)。

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